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IEnum
To allow you to count the number of items of a given type an object maintains,
OLE provides a set of enumeration interfaces, one for each type of item.
To use these interfaces, the client asks an object that maintains a collection
of items to create an enumerator object. The interface on the enumeration
object is one of the enumeration interfaces, all of which have a name of the form IEnumItem_name. Enumeration interfaces are specific to the type of item. All have the same
set of methods, and are used in the same way. For example, by repeatedly calling
the Next method, the client gets successive pointers to each item in the collection.
The following table lists the set of enumeration interfaces that OLE defines,
and the items enumerated.
Enumeration Interface Name
| Item Enumerated
| IEnumFORMATETC
| An array of FORMATETC structures
| IEnumMoniker
| The components of a moniker, or the monikers in a table.
| IEnumOLEVERB
| The different verbs available for an object, in order of ascending verb number.
| IEnumSTATDATA
| An array of STATDATA structures which contain advisory connection information for a data object.
| IEnumSTATSTG
| An array of STATSTG structures,which contain statistical information about a storage, stream, or
LockBytes object
| IEnumString
| Strings
| IEnumUnknown
| Enumerates IUnknown interface pointers
| IEnumVARIANT
| A collection of variants. It allows clients to enumerate heterogeneous
collections of objects and intrinsic types when the clients cannot or do not know the
specific type(s) of elements in the collection
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Methods in Vtable Order
IEnumXXXX Methods
| Description
| Next
| Retrieves a specified number of items in the enumeration sequence.
| Skip
| Skips over a specified number of items in the enumeration sequence.
| Reset
| Resets the enumeration sequence to the beginning.
| Clone
| Creates another enumerator that contains the same enumeration state as the
current one.
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